condition mean min max ZT0-3 61.755719 61.755719 61.755719 ZT4-7 34.373763999999994 34.373763999999994 34.373763999999994 ZT8-11 38.262538 38.262538 38.262538 ZT12-15 40.1622415 40.1622415 40.1622415 ZT16-19 54.946154500000006 54.946154500000006 54.946154500000006 ZT20-23 70.1920175 70.1920175 70.1920175